You said that you have substituted all the parts, but did you check that the power supply is producing both 5 and 12 volts.
If its only putting out 5 volts, the fans and lights will come on but without 12 volts it won't boot!
Recently my desktop wouldn't boot and it was the power supply! Cost me $20 for a new one!

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You said that you have substituted all the parts, but did you check that the power supply is producing both 5 and 12 volts.
If its only putting out 5 volts, the fans and lights will come on but without 12 volts it won't boot!
Recently my desktop wouldn't boot and it was the power supply! Cost me $20 for a new one!

ive already put two pc's side by side and pirated on the "good" pc power supply to verify the PS was bad before purchasing a new one.

You said that you have substituted all the parts, but did you check that the power supply is producing both 5 and 12 volts.
If its only putting out 5 volts, the fans and lights will come on but without 12 volts it won't boot!
Recently my desktop wouldn't boot and it was the power supply! Cost me $20 for a new one!

Tried a known good spare power supply. Same result. Nothing only fans.
Good call though.

I'm going to side with most everyone and guess your MB is toast, but double-check that everything is seated properly and no dust / debris is present in any of the slots. I work on PC's quite frequently at work and am guilty of this more often than I'd like to admit.

Agreed. I had suggested bad capacitors as a possible cause as this is such a common problem and displays the issues he is seeing. I also do a lot of work on PC's both individual and businesses.

Thanks for the site. Interesting, so I looked at my capacitors, and none display any of the signs of a dead one, (not to say one isn't dead) so I will wait until my new BIOS arrives. If it doesn't do the trick, I will go with "door number two" and pick up a used MB cheap. Thanks everyone for your help and suggestions.